21859697320 has 16 divisors (see below), whose sum is σ = 49184319060. Its totient is φ = 8743878912.

The previous prime is 21859697317. The next prime is 21859697339. The reversal of 21859697320 is 2379695812.

It can be written as a sum of positive squares in 2 ways, for example, as 20565280836 + 1294416484 = 143406^2 + 35978^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273246177 + ... + 273246256.

Almost surely, 2^21859697320 is an apocalyptic number.

21859697320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21859697320 is an abundant number, since it is smaller than the sum of its proper divisors (27324621740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21859697320 is a wasteful number, since it uses less digits than its factorization.

21859697320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546492444 (or 546492440 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 52.

The spelling of 21859697320 in words is "twenty-one billion, eight hundred fifty-nine million, six hundred ninety-seven thousand, three hundred twenty".